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By Gideon P.A.G. Van Zijl, Billy P. Boshoff
Collection of chosen papers on present advances in excessive functionality building fabrics. Contributions take care of the improvement, characterization, program methods, functionality and structural layout of fabrics with key power in civil engineering works. fabrics taken care of are fibre bolstered concrete, excessive functionality concrete, self compacting concrete and novel combos of those. For researchers, practitioners, experts, contractors and suppliers.
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Extra resources for Advances in Cement-Based Materials: Proc. Int. Conf. Advanced Concrete Materials, 17-19 Nov. 2009, Stellenbosch, South Africa
In the above reasoning, there is the implication that there is an optimal balance for each waterbinder ratio, occurring at each one for various reasons. This study, then, proposes that further research ought to be conducted to understand what the strengthening mechanisms behind the inclusion of RHA are, and how to best utilize those mechanisms for the specific aim of each application in which it is applied. While the above discussion is highly speculative, as is any discussion on the subject of cementitious hydration kinetics, there are some observations made while using an SEM that may suggest the occurrence of such a process.
It is important to note also the appearance of SDCA concrete, being less sticky than SCC with high fines content. The appearance of the concretes described in Table 1 is shown in Figure 1. Similar experience was performed in plant B where, as in the previous case, the aim was to decrease the cement content in order to obtain a concrete with self-compacting properties but with compressive strengths in the range of 25–30 MPa. The composition of the reference SCC, with 400 kg/m3 of cement, is shown in Table 2.
Again, it is interesting to note that the mixture with RHA seems to be more receptive of the higher temperature curing conditions found in the 7-4-2+ curing scheme. One possible explanation for this is the increased amount of silica within in the mixture for the possible formation of higher ordered C-S-H phases. 8 Effects of RHA on dynamic Young’s modulus From the notched beams broken for finding the fracture toughness, 38 mm × 38 mm × 127 mm prisms were cut and the dynamic Young’s Modulus was calculated using the longitudinal resonance frequency, in accordance with ASTM C 215, the results of which are given in table 3.
Advances in Cement-Based Materials: Proc. Int. Conf. Advanced Concrete Materials, 17-19 Nov. 2009, Stellenbosch, South Africa by Gideon P.A.G. Van Zijl, Billy P. Boshoff